RefreshRatePrefCtr: Correct the check of peak refresh rate

The peak refresh rate will not be guaranteed to be integer, but
config_defaultPeakRefreshRate only takes integer into the comparison.
To expose the smooth display is enabled by default in Settings, the
patch corrects the check of peak refresh rate with proper rounding.

Bug: 185102566
Test: Enable smooth display by default in Settings
Change-Id: I658ce22cf0b0a108c4b721e3e5320caf9c379639